const a:Array<number> = [1,2,3]
const date = new Date()
date.getTime()
const reg = /abc/
reg.test('abc')

Math.pow(2,2)

let body = document.body
let allLis = document.querySelectorAll('li')
allLis.keys()

document.addEventListener('click',(e)=>{
  e.preventDefault()
})

interface Iperson {
  name:string,
  age:number
}

let viking : Iperson = {name:'viking',age:20}
type IPartial = Partial<Iperson>
let viking2:IPartial = {name:'viking'}